Radiodial



oet. 25, 1927.

L. KNIGOFF i RADIODIAL Filed O t. 18. 1926 Patented Octo 25, 1927.

Lno xnreorr; or NEW YARK? N- Y! i l namonran. 1

epilation mea ottone: 15515926.' serian nanaiaaaj This invention relates to radio station selecting dials and in particular to one embodying therein a counterweight.

A particular object of the invention isl to provide a station selecting dial having. in-

corporated therein-'a suitable counterweight which will counterbalance the weight of the movable condenser .plates which are carried *y on the shaft to the end of which the selecting dial is secured.

A further object of the invention is to provide a simplified method-of attaching to the' dial, a counterweight of any desired dimension and weight which can bel suitably posi- I |tioned withinthe dial to counterbalance, as

before described, the weight of'y the movable` blades ofthe condenser.' l f yA further. particular object ofthe invention is to provide in combina-tion with either a solid type dial or hollow dia1,a counterweight of various configurations andwei hts so that the movable condenser. plates wi libe balanced and the manipulation' thereof, through the medium of the operating dial, will be more readily facilitated.

To enable others skilled in the art to `fully comprehend the underlying features of my invention that they may embody the same' inthe various modifications in structure and-- "the peripheral face of w i though not always, .luted or scored to provide-- relation contemplated', a drawing depicting a preferred form has been annexed as a part of this disclosure and in such drawings, sim-v ilar reference characters denote correspondin parts throughout all the views of which,

Ilgure 1 is a fragmenten view'in side elevation of a condenser an vradio receiving set panel, the shaft ofthe condenser.leaving1 provided thereon my improved radio dial which issli'own vin section to disclose on the interior thereof, the counterweight.

A Figure 2 isa front vview in elevation of the counterweighted dial, as seen in Figure 1. Figure 3 isa view in perspective of the counterweight itself, a portion thereof being broken away to show how the same is attached to thev interior ofthe dial.

Figure 4 is a modified' form illustrated as a face view in which is incorporated within the dial, a counterweight of diderent shape p d the rotor shaft 8,

and dimension, the dial itselfhaving a soli fin er gripping portion, and

igure 5 isa viewin perspective of the counterweight articularly suited for use with the solid ial, illustrated in Figure 4.

Referring to the drawings in detail 5 indcates a condenser of the standard type, the

rotation parts so that 'infr bakelite, hard rubber f the Y obliquel "when the counterweight fixed plates of which are indicated as at.6 and the movable ones by the numeral l7',l the latter b'ein secured in the usual manner to the rotor s aft 8', which extends through the radio receiving set vpanel 9 and has secured f at its outer end the dial 10. This dial, aftery f the usual order, is marked on its peripheral` edge, as at 11, with suitable indicating marks as used` in connection with radio receiving apparatus.

In order to adjusththe condenser. to 'tune the set into resonance with the wave length" .of a particular broadcastingstation, the' dial i isfre'volved in the well known manner and thereby causes rotation of the movable ele.

-ment 7 "of the condenser 5 as is well known;A

'In theV `radio art, various features have been incorporated in the different parts to 'eliminate friction and rto counterbalance the easy manipulation of the tuning vparts ma be accomplished and to 'this end, I.` provi e an improved dial 10 of hollow 'constructiomthematerial used beor other suitable substance and the .dial being cast to provide Vdisposed scale bearlng portion 12 which is formed'at the edge of the base 13 concentrically with which is cast the upstanding linger 'gripping ortionor knob 14,

a lfirmer grip the fingers in rotating the for dialt In order to counterbalance the weight of the moving plate threaded interiorly to receive the holding screws 17. These holding screws pass through suitable openings 18 in the counterweight 15 and may be arranged according to the shape of the counterweight. In this instance I have provided a projected end 19 on the counterweight and an enlarged, opposite portion 20,'t'he center thereof being ierced with a bore 21 into which extends which carries the movable condenser element 7. Longitudinally of the counterweight 15 and extendmg upwardly from the bottom thereof, 1n t e portion 20, I provide va threaded bore v22,

15 1s 1n place, this bore matching with an opening 23 in the 16, which extend inwardly fromv vthe faceof the knob portion` 14 and are enlarged fingen-knob Asurface 14 and through which is threaded, a set screw 24. This setscrew not only acts to secure the counterweightin posi- .tion within the dial, but also connects the dial itself with the end of therotor shaft 8.

It is evident that the counterweightmay:H

be of metal or other suitable, heavy material, and may be cast in the particular shape or design desired to carry out .the counterbalancing feature of my invention, and it is evident that-any number of screws 17 may be'fused to attach the counterweight in position within the knob lfifjof the dial.

Inlreferring to Figures 4 and 5, I have shown a dial which is cast with al solid knob portion in connection with which is incor- Eorated,a counterbalancing weight '26, which ts within a suitabley depression formed in the knob 25 when the same is cast, the depression'being arranged to receive the counterweight26 which is Secured inposition through the medium of the screws 27 which vare passed'through the counterweight 26 and are secured in the body of the' dial much in the same manner as that outlined inFigure 2. The counterweight'itself is-'arranged to encompass the end"of the shaft 8, ifdesired,

v or being provided with a bearingso thait rests beneath the shaft 8, the counterweight itself being provided with the usual set screw- 28 which retains the dial in connection with the end of the shaft 8, as heretofore described.

It will be evident, therefore, that I have provided an improved counterweighted dial, which will render the operation of the movable condenser plate more easy and will also tend to maintain them securely in the position to which they are revolved, as-it has often been the case, that the weight of the plate, when turned to an angular position,

due to vibration of the set, or outside vibra.

tion, gradually turn from their position and destroy the tune of the set.

While I'have illustrated and described my ving a plurality of movable plate members and an operatingshafnof a dial, for indicating the position of the plate members, a counterweight arranged in said dial,means ,for fastening the'counterweight in the dial and said counte'rweight providing a bearing for said shaft.

2, The combination with a condenser having a plurality of movable plates and -a shaft for operating said plates, of a dial, the dial being cast to provide an extended linger knob portion, a counterwieght in said knob, and means extending through the knob and counterweight for securing the dialto the condenser shaft.

3. The combinationwith a condenser shaft,

Yof a dial, cast to provide an extended linger knob portion, a counterweight in said knob, means extending through the knob and the counterweight for securing the dial to the condenser shaft and means vfor securing the counterweighteto the interior of the knob portion. e

k4.' The radio dial comprising a finger. knob portion of hollow construction, a counter- Weight in said dial having a shaft opening therein, means for securin the counterweight in the knob, and means securingv the counterweight to a shaft. g

In testimony whereof I aiiix my signature.

[11. s.] LEO KNIGOFF. l 

